{"record":{"id":"46658988553f5346","repo":"ramsey/uuid","slug":"unable-to-get-a-group-identifier-using-the-system","errorCode":null,"errorMessage":"Unable to get a group identifier using the system DCE Security provider; please provide a custom identifier or use a different provider","messagePattern":"Unable to get a group identifier using the system DCE Security provider; please provide a custom identifier or use a different provider","errorType":"exception","errorClass":"DceSecurityException","httpStatus":null,"severity":"error","filePath":"src/Provider/Dce/SystemDceSecurityProvider.php","lineNumber":86,"sourceCode":"     * @throws DceSecurityException if unable to get a group identifier\n     *\n     * @inheritDoc\n     */\n    public function getGid(): IntegerObject\n    {\n        /** @var IntegerObject | int | float | string | null $gid */\n        static $gid = null;\n\n        if ($gid instanceof IntegerObject) {\n            return $gid;\n        }\n\n        if ($gid === null) {\n            $gid = $this->getSystemGid();\n        }\n\n        if ($gid === '') {\n            throw new DceSecurityException(\n                'Unable to get a group identifier using the system DCE Security provider; please provide a custom '\n                . 'identifier or use a different provider',\n            );\n        }\n\n        $gid = new IntegerObject($gid);\n\n        return $gid;\n    }\n\n    /**\n     * Returns the UID from the system\n     */\n    private function getSystemUid(): string\n    {\n        if (!$this->hasShellExec()) {\n            return '';\n        }","sourceCodeStart":68,"sourceCodeEnd":104,"githubUrl":"https://github.com/ramsey/uuid/blob/da5b521600a707d2dd097598464bd3090de850f5/src/Provider/Dce/SystemDceSecurityProvider.php#L68-L104","documentation":"The GID counterpart of getUid(): SystemDceSecurityProvider::getGid() backs Uuid::uuid2() with DCE_DOMAIN_GROUP. getSystemGid() runs shell_exec('id -g') (or parses Windows net user output for group SIDs); when it returns an empty string, getGid() throws DceSecurityException because no group identifier could be determined for the DCE security domain.","triggerScenarios":"Calling Uuid::uuid2(Uuid::DCE_DOMAIN_GROUP) without an explicit identifier on systems where shell_exec is disabled via disable_functions, 'id -g' is absent from the container image, or Windows group output parsing fails. The empty result is cached in a static, so all later calls in the process throw too.","commonSituations":"Locked-down shared hosting; distroless/minimal Docker images; Windows deployments; generating group-scoped v2 UUIDs in long-lived workers where the first failed lookup is cached.","solutions":["Pass the GID explicitly: Uuid::uuid2(Uuid::DCE_DOMAIN_GROUP, posix_getgid()) or a known group number","Inject a custom DceSecurityProviderInterface into a UuidFactory for your environment","Verify shell_exec is not disabled and the id utility exists, or avoid uuid2 for group identifiers"],"exampleFix":"// before\n$uuid = \\Ramsey\\Uuid\\Uuid::uuid2(\\Ramsey\\Uuid\\Uuid::DCE_DOMAIN_GROUP);\n\n// after\n$gid = function_exists('posix_getgid') ? posix_getgid() : 0;\n$uuid = \\Ramsey\\Uuid\\Uuid::uuid2(\\Ramsey\\Uuid\\Uuid::DCE_DOMAIN_GROUP, $gid);","handlingStrategy":"fallback","validationCode":"if (function_exists('posix_getgid')) {\n    $uuid = \\Ramsey\\Uuid\\Uuid::uuid2(\\Ramsey\\Uuid\\Uuid::DCE_DOMAIN_GROUP, posix_getgid());\n} else {\n    $uuid = \\Ramsey\\Uuid\\Uuid::uuid2(\\Ramsey\\Uuid\\Uuid::DCE_DOMAIN_GROUP, 0);\n}","typeGuard":"function canResolveSystemGid(): bool\n{\n    return function_exists('shell_exec')\n        && !str_contains(strtolower((string) ini_get('disable_functions')), 'shell_exec');\n}","tryCatchPattern":"try {\n    $uuid = \\Ramsey\\Uuid\\Uuid::uuid2(\\Ramsey\\Uuid\\Uuid::DCE_DOMAIN_GROUP);\n} catch (\\Ramsey\\Uuid\\Exception\\DceSecurityException $e) {\n    $gid = function_exists('posix_getgid') ? posix_getgid() : 0;\n    $uuid = \\Ramsey\\Uuid\\Uuid::uuid2(\\Ramsey\\Uuid\\Uuid::DCE_DOMAIN_GROUP, $gid);\n}","preventionTips":["Always pass an explicit GID for group-domain v2 UUIDs","Cache a resolved GID yourself rather than relying on the provider's static cache","Document shell_exec/id requirements in deployment checklists"],"tags":["php","ramsey-uuid","dce-security","uuid-v2","shell-exec","disable-functions","posix"],"backgroundTag":"posix-gid-lookup-failed","analyzedSha":"da5b521600a707d2dd097598464bd3090de850f5","analyzedAt":"2026-08-21T01:35:29.252Z","schemaVersion":2},"datasetVersion":"2026-08-21T03:17:12.404Z"}